Abstract
This chapter presents the cooling system of a demonstrative high temperature superconducting (HTS) generator, in which solid nitrogen (SN2) is used as cryogen to keep the operating temperature of HTS synchronous machine. Its tasks are to pursue the minimal volume of HTS magnets and utilize the configuration characteristic of conventional generator. Its hybrid rotor has three novel aspects: the HTS magnets are installed on a warm iron core; four Dewar flasks having racetrack outline are distributed symmetrically, and SN2 is used as cryogen. Furthermore, evaporative cooling technology is applied to solve the cooling problem of the stator, which is more effective than air-cooling technology and more safer than water inner cooling technology. The pressure losses of GHe through rotor are analyzed. It can be inferred that centrifugal force has significant impact on GHe flow, and the effects of pressure and Coriolis force can be ignored. The steady temperature field is also simulated by ANSOFT, and the results indicate that the maximal temperature of HTS coils is lower than 30 K and distributed uniformly, while the GHe (15 K) velocity is 0.2 m/s.
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